In addition to the Karma you can give to a user for making a helpful post, I think that each individual post should have a like / dislike of rate 1 - 5 system. This is so
other users can rate a particular post up if they think that it is very helpful to the OP, or they agree with it, or rate it down because it is untruthful, etc. There would
be a bar showing number of likes / dislikes, or if the 1 - 5 system is used, the average rating and number of ratings. Agree? Disagree? If you disagree, please politely explain why this would not work out.